Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood [1]. While there is no conclusive evidence that suggests that Lipitor has a direct impact on endurance athletes, there are some studies that suggest that statins, including Lipitor, may affect muscle performance and endurance.

A study published in the Journal of Physiology found that statins may impair the function of mitochondria, which are responsible for producing energy in the muscles [2]. This could potentially lead to reduced muscle performance and endurance in athletes. However, the study also noted that the effects of statins on muscle function may vary depending on the individual and the dosage of the medication.

Another study published in the European Journal of Preventive Cardiology found that statins may have a small but significant impact on exercise capacity in some individuals [3]. The study suggested that the negative effects of statins on muscle function may be more pronounced in individuals who are already physically active, such as endurance athletes.

It is important to note that the effects of Lipitor on endurance athletes are not well understood and may vary depending on the individual. Athletes who are taking Lipitor or any other statin medication should consult with their doctor to determine if the medication is affecting their performance and to discuss potential alternatives.

Sources:
[1] DrugPatentWatch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] Phillips, P. S., & Haas, R. H. (2007). Statin myopathy: a common dilemma not reflected in clinical trials. The Journal of Physiology, 585(1), 3-7. doi: 10.1113/jphysiol.2007.144709. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2375551/
[3] Mika, P., et al. (2017). Statin therapy and exercise adaptations – a systematic review. European Journal of Preventive Cardiology, 24(12), 1296-1309. doi: 10.1177/2047487317725745. Retrieved from https://pubmed.ncbi.nlm.nih.gov/28807461/.